Expandable strip of teaching-aid



FIG. 1 is a perspective view of an expandable strip of teaching-aidshowing my new design;

FIG. 2 is a front elevation thereof;

FIG. 3 is a rear elevation thereof;

FIG. 4 is a left side elevation thereof;

FIG. 5 is a right side elevation thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a reference showing a using position of the expandable stripof teaching-aid, and it is expandable by overlapping two elements on topof the other.

The ornamental design for a “an expandable strip of teaching-aid,” asshown and described.